The San Francisco 49ers placed running back Christian McCaffrey on injured reserve Tuesday a day after coach Kyle Shanahan indicated that both he and fellow running back Jordan Mason would go on IR after suffering injuries in the team’s Week 13 loss to the Buffalo Bills.

Christian McCaffrey is dealing with an injury again. The 49ers running back went down with a knee injury in the second quarter against the Bills.

The San Francisco 49ers shored up their suddenly thin running back corps on Tuesday by claiming Israel Abanikanda off waivers from the New York Jets. In a corresponding move, the Niners placed Christian McCaffrey on injured reserve after he suffered a right knee injury in Sunday night’s 35-10 loss to the Bills.